Light emission display, display panel, and driving method thereof

Abstract

A light emission display includes data lines, scan lines, and pixel circuits. A pixel circuit of the pixel circuits includes: a light emission element; a first transistor including a control electrode and first and second electrodes, the first transistor outputting a current corresponding to a voltage between the first electrode and the control electrode; a first switch coupled between the control electrode of the first transistor and the light emission element and for receiving a first control signal; a first capacitor coupled to the first transistor; a second capacitor coupled between a first power source and the first capacitor; a second switch for coupling the first capacitor and a second power source in response to a second control signal; and a third switch for applying a data voltage to the first capacitor in response to a select signal provided by one of the scan lines.

Description

CROSS REFERENCE TO RELATED APPLICATION [0001] This application claims priority to and the benefit of Korea Patent Application No. 10-2004-0016139 filed on Mar. 10, 2004 in the Korean Intellectual Property Office, the entire content of which is incorporated herein by reference. BACKGROUND OF THE INVENTION [0002] (a) Field of the Invention [0003] The present invention relates to a display device. More specifically, the present invention relates to an organic electroluminescent (EL) display, a display panel, and a driving method thereof. [0004] (b) Description of the Related Art [0005] In general, an organic electroluminescent (EL) display is a display device that electrically excites a phosphorous organic compound in a plurality of organic light emitting diodes (OLEDs) to emit light. The organic EL display voltage- or current-drives N×M organic emitting cells to display images. An organic emitting cell of the organic EL display includes an anode (ITO), an organic thin film, and a cath...

AI Technical Summary

Benefits of technology

[0020] In one embodiment of the present invention, a pixel circuit is provided. The pixel circuit is coupled to a first scan line for applying a first signal, a second scan line for applying a second signal, and a data line for applying a data voltage and includes: a driving transistor, a display element, a first switching transistor, a compensation device, a storage capacitor, and a second switching transistor. The driving transistor includes a control electrode, a first electrode coupled to a first power source, and a second electrode and is for outputting a current corresponding to a voltage between the first electrode and the control electrode. The di

Problems solved by technology

Also, a short range (SR) uniformity problem is generated because the amount of currents supplied to the organic EL element OLED is varied by a deviation of the threshold voltage (Vth) of a thin-film transistor (TFT) caused by non-uniformity of the manufacturing process, in addition to a brightness difference generated by a voltage drop of the above-described voltage (VDD) supply line.

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